Take the ark of the LORD, set it on the cart, and in a chest beside it put the gold objects you are sending Him as a guilt offering. Then send the ark on its way,

Leviticus 5:7
If, however, he cannot afford a lamb, he may bring to the LORD as restitution for his sin two turtledoves or two young pigeons--one as a sin offering and the other as a burnt offering.

1 Samuel 6:3
They replied, "If you return the ark of the God of Israel, do not send it away empty, but by all means return it to Him with a guilt offering. Then you will be healed, and you will understand why His hand has not been lifted from you."

1 Samuel 6:4
"What guilt offering should we send back to Him?" asked the Philistines. "Five gold tumors and five gold rats," they said, "according to the number of rulers of the Philistines, since the same plague has struck both you and your rulers.

1 Samuel 6:5
Make images of your tumors and of the rats that are ravaging the land. Give glory to the God of Israel, and perhaps He will lift His hand from you and your gods and your land.

And take the ark of the LORD, and lay it on the cart; and put the jewels of gold, which you return him for a trespass offering, in a coffer by the side thereof; and send it away, that it may go.